204 No Content: alternate content length doesn't match doc_len #9816
Description
We found some extraneous logs in our lab server running ATS 9.2.1. It looks like it is not expecting text after a 204 status code but the extra length seems to be attributable to the text string No content.
At first, looks like this might have been related to #9330 and #9333 but they have been merged in 9.2.1.
Log entry:
WARNING: OpenReadHead failed for cachekey 809A6934 : alternate content length doesn't match doc_len 10 != 0
curl command we've been able to use to reproduce (internally):
# curl 'http://cdn.de2scvmedia.cdn1.coxlab.net/scm/ODCconfig/ServiceGroup?system=1902&QAMNameList=4501,4502' -v -4
> GET /scm/ODCconfig/ServiceGroup?system=1902&QAMNameList=4501,4502 HTTP/1.1
> Host: cdn.de2scvmedia.cdn1.coxlab.net
> User-Agent: curl/7.76.1
> Accept: */*
>
* Mark bundle as not supporting multiuse
< HTTP/1.1 204 No Content
< X-Cox-Request-Id: rEbSa6_SN_gEzHMP
< Date: Fri, 09 Jun 2023 12:13:19 GMT
< X-Cacheable: YES
< Varnish-TTL: 3600.000
< X-Varnish: 423353 423190
< Age: 875
< Via: 1.1 varnish (Varnish/6.1), http/1.1 psp6cdmid04.coxlab.net (11590.el7 [uScSsSfUpSeN:t cCSp sS]), http/1.1 psp6cdedge09.coxlab.net (13890.el7 [uScSsSfUpSeN:t cCSpSs ])
< X-Served-By: de2scvcache02
< X-Cache: HIT
< X-Cache-Hits: 1
< Server: 13890.el7
< Connection: keep-alive
<
* Excess found: excess = 10 url = /scm/ODCconfig/ServiceGroup (zero-length body)
* Connection #0 to host cdn.de2scvmedia.cdn1.coxlab.net left intact